In sandboxed renderers we use browserify to provide a node-like environment. The
Buffer class used by browserify is actually just a wrapper around Uint8Array,
but to deserialize Buffer correctly we must expose the class as a hidden value
and use it in V8ValueConverter.
This change gives sandboxed renderer scripts a similar structure to what already
exists in the lib/{browser,renderer,common} directories.
It also allows sandboxed renderer initialization to share more code with
non-sandboxed renderers (ipcRenderer is now imported directly from
lib/renderer/api/ipc-renderer).
- Adapt node.cc code that implements `process.binding` to create a similar
object in AtomSandboxedRendererClient.
- Replace the ipc binding object passed to `lib/sandboxed_renderer/init.js` by
the new binding object.
- Refactor the initialization script to use this new object to fetch the ipc
binding and store as a hidden value using the `v8_util` module.
This change also required applying a patch to node.js, so the submodule commit
was updated.
